How do you return certain properties from a linq query, rather than complete objects?

5
votes

I've just downloaded the Linq provider for NHibernate and am just a little excited. But I don't know Linq syntax that well.

I can return whole objects from a query like this:

var query = from foo in session.Linq<Kctc.BusinessLayer.Domain.Case>()
                  where foo.CaseNumber > 0
                  select foo;

And I can select a single property like this:

var query = from foo in session.Linq<Kctc.BusinessLayer.Domain.Case>()
                  where foo.CaseNumber > 0
                  select foo.Id;

But how would I select two properties, e.g. foo.Id and foo.Bar? Or is that not possible?

Thanks

David

2
linqnhibernatelinq-to-nhibernate

2 Answers

8
votes

Use an anonymous projection:

var query = from foo in session.Linq<Kctc.BusinessLayer.Domain.Case>() 
              where foo.CaseNumber > 0 
              select new { foo.Id, foo.Bar };
1
votes

You have to create a new Anonymous type, that will only be available in the current scope (i.e. it can't be returned from a method etc.)

var query = from foo in session.Linq<Kctc.BusinessLayer.Domain.Case>() 
              where foo.CaseNumber > 0 
              select new { foo.Id, foo.Bar };

Or you can create a custom class and populate that.